CN1329775A - Method and device for controlling power output stage - Google Patents
Method and device for controlling power output stage Download PDFInfo
- Publication number
- CN1329775A CN1329775A CN99814088A CN99814088A CN1329775A CN 1329775 A CN1329775 A CN 1329775A CN 99814088 A CN99814088 A CN 99814088A CN 99814088 A CN99814088 A CN 99814088A CN 1329775 A CN1329775 A CN 1329775A
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- Prior art keywords
- current
- predetermined
- voltage
- constant
- drain
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/042—Modifications for accelerating switching by feedback from the output circuit to the control circuit
- H03K17/04206—Modifications for accelerating switching by feedback from the output circuit to the control circuit in field-effect transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
- H03K17/165—Modifications for eliminating interference voltages or currents in field-effect transistor switches by feedback from the output circuit to the control circuit
- H03K17/166—Soft switching
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- Electronic Switches (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention relates to a power output stage (T) which is charged with a high charging current (Ig1) in order to effect an electromagnetic interference-compatible control. The power output stage is charged until the drain current (Id) exceeds a current threshold value (Is), is subsequently charged with a lower charging current (Ig2), said lower charging current being associated with the desired slew rate, until the drain voltage (Vd) falls below a predetermined voltage threshold value (Vs), and, afterwards, is subjected to a continual charging with the high charging current(Ig1) for a predetermined duration (Tv). To effect a closing control, the operation is carried out in an almost reversed sequence.
Description
The present invention relates to a kind of method of control inductive load as described in the preamble as claimed in claim 1.The invention still further relates to a kind of device of realizing this method.
In order to control inductive load, adopt power output stage to be used as power switch with transistor, especially mosfet transistor.When turn-offing transistor, the energy of inductive load must be decomposed by the Zener effect of final stage, or utilizes the idle running diode to consume.Have in load under the situation of higher inductance energy, adopt an idle running diode at the load two ends.This final stage, the especially shortcoming of pulsed final stage are that it can cause bigger electromagnetic interference.
The change in voltage that a reason as you know is exactly tie point place between load and the power switch is very fast.For example, utilizing resistance control end to be carried out to run into this reason in high value circuit control, that have MOSFET.
The Another reason that causes electromagnetic interference is that also the electric current that is switched the power switch of flowing through that is caused by switch changes very fast.
US4 once disclosed a kind of power output stage that is used for inductive load with idle running diode in 661,766, and wherein, the electric current pace of change of flow through power switch or idle running diode is adjusted to a predetermined value.Yet, but postponed described switching process thus greatly, also promptly postponed to carry out the transition to conducting state or process in contrast from off state.
Task of the present invention is, a kind of method of controlling inductive load is provided, and utilizes it can reduce electromagnetic interference, and can make switching delay (time of delay) and loss power keep less.Task of the present invention also is to create a kind of device of realizing this method.
According to the present invention, this task is realized by the characteristic of claim 1 and 3.
The advantage of circuit of the present invention is, can simply He correctly only adjust the electric current pace of change so steep, makes big interference can not occur, and circuit delay is also little simultaneously.
Tell about the present invention in detail by accompanying drawing below.Wherein:
Fig. 1 is an embodiment of power output stage of the present invention,
Fig. 2 is the flow chart of operation the inventive method,
Fig. 3 is that voltage and the electric current when connecting load changes procedure chart, and
Fig. 4 is that voltage and the electric current when disconnecting consumers changes procedure chart.
As shown in Figure 1, tell about the present invention by a kind of pulsed power output stage that is applied in the automobile and is installed in the integrated circuit below, this power output stage is used to that the inductive load L with idle running diode F is carried out switch and switches.Described integrated power output stage for example can be placed in the not shown motor controller, and this power output stage obtains control signal st from motor controller, so as pulsed turn on and off such as be used for the inductive load L of waste gas feedback regulation valve.Control the open size of this valve according to the pulse duty factor of being adjusted.
Be connected to a series circuit of being made up of inductive load L and power switch T on the electrode+Vb of unshowned voltage source such as automobile batteries and GND, described power switch T realizes with MOSFET.
Described load L is between the drain electrode d and voltage source positive pole+Vb of power switch T.Source electrode s joins by test resistance R and negative pole GND.The idle running diode F of a current direction positive pole+Vb in parallel on load L.In order to protect power switch T, between drain electrode d and gate pole g, placed a series circuit, this series circuit is made up of the Zener diode Z of current direction drain electrode d and the diode D of current direction gate pole g.
The control of power switch T realizes by control circuit ST, in this control circuit, control signal st, drain voltage Vd are converted to the control signal k1~k4 that is used for constant-current source K1~K4 with the comparative result of the electric current of the comparative result of predetermined voltage threshold Vs and the power switch T that flows through and predetermined current threshold Is, and the electric current of the power switch T that wherein flows through is called as drain current Id hereinafter.So select described voltage threshold Vs, make its be less than about cell voltage Vb (such as Vb=14V, Vs=13V), and current threshold Is account for drain current rated value Id 1/10th to 1/20th (such as Id=2A, Is=100mA).
For realizing voltage and current ratio, in control circuit ST, installed two comparator C v and Ci, except predetermined threshold value Vs and Is, they also import drain voltage Vd and drain current Id (as the magnitude of voltage I ' d that descends) on test resistance R.
Described constant-current source K1~K4 produces constant charge or discharge electric current I g1~Ig4 when on-state, the gate pole of described power switch T utilizes this electric current to carry out charge or discharge.
Control circuit ST and constant-current source K1~K4 utilizes the supply power voltage Vcc that can extract on electrode+Vcc and GND to carry out work, wherein, constant-current source K1 parallel with one another and K2 are placed between positive pole+Vcc and the gate pole g, and when on-state, add to point to charging current Ig1 and the Ig2 of gate pole g, same constant-current source K3 and K4 parallel with one another is placed between gate pole g and the negative pole GND, and adds discharging current Ig3 and the Ig4 that points out from gate pole g when on-state.
Electric current I g1, Ig3 (such as 2mA) that constant-current source K1 and K3 produce exceed constant-current source K2 and K4 (Ig2 with the factor 10, Ig4), rise or decrease speed (electric current rate of change) according to required drain current, constant-current source K2 and K4 for example produce the electric current of 0.2mA at this, and this is to represent with the thickness arrow of indication respective electrical flow path direction in constant-current source K1~K4 in Fig. 1.
Telling about by Fig. 1~4 below utilizes power output stage that inductive load is carried out the method that switch switches.Flow chart shown in Figure 2 has drawn and load has been carried out the procedure that turns on and off continuously of pulsed.Hereinafter, the Roman number explanation with the parantheses setting is a method step of representing that each indicates with Roman number.
Fig. 3 shows electric current and the change in voltage curve when connecting load L, Fig. 4 then illustrates is electric current and change in voltage curve when disconnecting consumers, the drain voltage Vd curve and the drain current Id curve that have wherein drawn control signal st, charging current (having plus sign in Fig. 3), discharging current (having minus symbol in Fig. 4) and obtained in drain electrode d place thus.In addition, voltage threshold Vs and current threshold Is been have also have been marked and drawed.
Fig. 3 and 4 shows electric current and the voltage during pulse operation, also promptly is not the situation when connecting load for the first time when the operation beginning.
Equal 1 (I) if connect the control signal st of load L when time point t1, then signal k1 of control circuit ST output makes constant-current source K1 connect (II), has a big charging current Ig1 to flow to the gate pole of power switch T thus, so that its quick charge.After this, in case the drain current Id that rises surpasses threshold value Is (III) at time point t2, then constant-current source K1 is turned off, and connect the constant-current source K2 with signal k2 replace it (IV), on gate pole load little charging current Ig2 by this constant-current source K2 this moment.
Drain current Id rises to its theoretical value now with the required rate of climb, thus, the drain voltage Vd of the magnitude of voltage on the diode F that goes out to dally greatly than cell voltage+Vb because of the idle running electric current of flowing through under the nonconducting state of power switch T is lowered, and power switch T carries out the transition to current conductive state.
In case drain voltage Vd is lower than voltage threshold Vs (V) at time point t3, then constant-current source K2 is turned off, and constant-current source K1 connected once more a predetermined time delay Tv (VI, VII).Fully drive described power switch T by this measure with bigger charging current Ig1, and the resistance between its drain-source utmost point is minimized, therefore when conducting state, have only minimum voltage drop on the power switch T.
After past, disconnect constant-current source K1 once more at predetermined time delay Tv at time point t4; (VIII) connected in load this moment fully.This state remains to control signal st in time point t5 (see figure 4) vanishing (IX) always, and also promptly this moment should switching off load L.
Utilize the end of control signal st=0 to connect constant-current source K3 (X), the gate pole from power switch T flows out a big discharging current Ig3 thus.Drain voltage Vd rises thus.If it surpasses voltage threshold Vs (XI) at time point t6, then constant-current source K3 is turned off, and constant-current source K4 conducting (XII), thus drain current Id with required, diminish with the corresponding electric current decrease speed of discharging current Ig4, and receive this electric current by the idle running branch road.Drain voltage Vd rises to one again than cell voltage+Vb go out to dally greatly value of diode F both end voltage.
In case drain current is lower than current threshold Is (XIII), then constant-current source K4 is turned off, and recloses a predetermined time delay Tv of constant-current source K3 (XIV), so that vacate gate pole with bigger discharging current Ig3 at this moment and power switch T is turn-offed.After past (XV), constant-current source K3 is turned off (XVI), realizes output state thus once more at predetermined time delay Tv.Can continue to apply pulse (I) this moment, or finish the driving of load.
By power switch alternately being discharged and recharged with bigger or less charge or discharge electric current, can realize that turn-on and turn-off can keep less time of delay and (only utilize when controlling with required rising and the corresponding little charge or discharge stream of decrease speed, need to continue the time of 10~20 double-lengths), and not having or only occur the electromagnetic interference of trace, this is because rising and the decrease speed of described drain current Id are limited in a predetermined value.
In this embodiment, numerical value | Ig1|=|Ig3|, | Ig2|=|Ig4| and (during charging) | Tv|=(during discharge) | Tv| is chosen to identical size.But this tittle also can be chosen to different sizes as required.
Claims (3)
- By control signal (st) power controlling final stage in case to the electrode that is connected on voltage source by power switch (T) (+Vb, GND) method that switch switches is carried out in the load on (L),It is characterized in that:Described power switch (T)-from the beginning of control signal (st), charge with a predetermined big charging current (Ig1), up to drain current (Id) surpass predetermined current threshold value (Is) (t1~t2),-then, next use a predetermined little charging current (Ig2) to charge, up to drain voltage (Vd) be lower than predetermined voltage threshold (Vs) (t2~t3), and-then with a predetermined big charging current (Ig1) charge a predetermined charging time delay (Tv) (t3~t4),-from the end of control signal (st), discharge with a predetermined big discharging current (Ig3), up to drain voltage (Vd) surpass described predetermined voltage threshold (Vs) (t5~t6),-then, next use a predetermined little discharging current (Ig4) to discharge, up to drain current (Id) be lower than described predetermined current threshold value (Is) (t6~t7), and-then with described predetermined big discharging current (Ig3) predetermined discharge time delay (the Tv) (t3~t4) that discharges.
- 2. the method for claim 1 is characterized in that: the maximal velocity of described drain current (Id) is determined that by described little charging current value (Ig2) its decrease speed is then determined by described little discharge current value (Ig4).
- 3. be used to realize the device of the described method of claim 1, it is characterized in that:-the positive pole of supply power voltage (+Vcc) and be connected to a constant-current source (K1) that is used for big charging current (Ig1) between the gate pole (g) of power switch (T), and be parallel with a constant-current source (K2) that is used for little charging current (Ig2) on this constant-current source (K1),-between the negative pole (GND) of the gate pole (g) of described power switch (T) and supply power voltage, be connected to a constant-current source (K3) that is used for big discharging current (Ig3), and also be parallel with a constant-current source (K4) that is used for little discharging current (Ig4) on this constant-current source (K3), and-control circuit (ST) in supply power voltage (Vcc) work of going up is set, by control program shown in Figure 2, by the switching signal of this control circuit (k1~k4) according to following aspect turn on and off described constant-current source (K1~K4):-control signal (st),Ratio Vd>the Vs or the Vd<Vs of the same predetermined voltage threshold of-drain voltage (Vd) (Vs),Ratio I d>the Is or the Id<Is of the same predetermined current threshold of drain current (Id) (Is) of-the power switch of flowing through (T), and-at least one predetermined time delay (Tv).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19855604.7 | 1998-12-02 | ||
DE19855604A DE19855604C5 (en) | 1998-12-02 | 1998-12-02 | Method and device for controlling a power output stage |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1329775A true CN1329775A (en) | 2002-01-02 |
CN1156976C CN1156976C (en) | 2004-07-07 |
Family
ID=7889742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CNB998140880A Expired - Fee Related CN1156976C (en) | 1998-12-02 | 1999-12-01 | Method and device for controlling power output stage |
Country Status (8)
Country | Link |
---|---|
US (1) | US6556407B2 (en) |
EP (1) | EP1147607B1 (en) |
KR (1) | KR100385746B1 (en) |
CN (1) | CN1156976C (en) |
BR (1) | BR9915871B1 (en) |
CA (1) | CA2353731A1 (en) |
DE (1) | DE19855604C5 (en) |
WO (1) | WO2000033462A1 (en) |
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CN103152022A (en) * | 2007-05-21 | 2013-06-12 | 先进模拟科技公司 | MOSFET gate drive with reduced power loss |
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DE102008026500B4 (en) * | 2007-12-30 | 2021-07-01 | Dmos Gmbh | Method and device for regulating the commutation speed between series-connected power electronic actuators with an inductive load |
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1998
- 1998-12-02 DE DE19855604A patent/DE19855604C5/en not_active Expired - Fee Related
-
1999
- 1999-12-01 WO PCT/DE1999/003816 patent/WO2000033462A1/en active IP Right Grant
- 1999-12-01 BR BRPI9915871-0A patent/BR9915871B1/en not_active IP Right Cessation
- 1999-12-01 EP EP99966809A patent/EP1147607B1/en not_active Expired - Lifetime
- 1999-12-01 CA CA002353731A patent/CA2353731A1/en not_active Abandoned
- 1999-12-01 CN CNB998140880A patent/CN1156976C/en not_active Expired - Fee Related
- 1999-12-01 KR KR10-2001-7006867A patent/KR100385746B1/en not_active IP Right Cessation
-
2001
- 2001-06-04 US US09/873,648 patent/US6556407B2/en not_active Expired - Fee Related
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Publication number | Priority date | Publication date | Assignee | Title |
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CN101212171B (en) * | 2006-12-28 | 2010-06-16 | 台湾积体电路制造股份有限公司 | Clock generator with reduced electromagnetic interference for DC-DC converters |
CN103152022A (en) * | 2007-05-21 | 2013-06-12 | 先进模拟科技公司 | MOSFET gate drive with reduced power loss |
Also Published As
Publication number | Publication date |
---|---|
KR100385746B1 (en) | 2003-06-02 |
US20010040470A1 (en) | 2001-11-15 |
BR9915871A (en) | 2001-08-21 |
WO2000033462A1 (en) | 2000-06-08 |
EP1147607A1 (en) | 2001-10-24 |
CN1156976C (en) | 2004-07-07 |
DE19855604C5 (en) | 2004-04-15 |
KR20010093138A (en) | 2001-10-27 |
CA2353731A1 (en) | 2000-06-08 |
BR9915871B1 (en) | 2012-02-07 |
EP1147607B1 (en) | 2006-08-23 |
DE19855604C1 (en) | 2000-06-15 |
US6556407B2 (en) | 2003-04-29 |
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